Worksheet Chapter 10: Sound Waves

1. Compare the acoustic characteristics of hard, smooth surfaces versus soft, rough surfaces regarding reflection and absorption of sound waves.

2. Explain why an astronaut on the surface of the Moon cannot hear their partner shouting unless they use radio communication equipment.

3. True or False: The Doppler Effect causes an observer to hear a higher pitch when a sound source moves away from them.

4. State TWO applications of ultrasound technology in daily life or modern industry.

5. Fill in the blank: Sound waves cannot propagate through a ________ because there are no particles to transmit mechanical vibrations.

6. Which wave property determines the pitch of a sound note?

7. True or False: Sound travels faster through air than through an iron metal rod.

8. Describe the Doppler Effect experienced by a bystander standing on a pavement as a police car blowing its siren approaches and then passes away from them.

9. A research vessel uses SONAR to map the seabed floor. An ultrasonic signal transmitted into the sea returns as an echo after 2.0 seconds. Calculate the ocean depth if the speed of sound in seawater is 1,500 m/s.

10. A sound wave has a frequency of 500 Hz. Explain what '500 Hz' means in terms of particle vibrations.